Question

哟！我正在尝试使用Slick2d，JBox2d和Tiled在Java中制作一个小型的爱好游戏，但我遇到了一个恼人的问题。我的游戏目前包括一个在小舞台上飞来飞去的宇宙飞船。我设法让运动恰到好处，甚至还有一个旋转的小型加农炮跟随光标。相机是聚焦的，所以船总是在中心。我的问题是我无法获得任何方法告诉我是否按下鼠标按钮才能工作。当船静止不动时它们工作正常，但是当它加速时它会停止工作..当船达到最大速度时它会再次起作用！所以当船加速时，鼠标按钮事件不会被触发！？如果您对可能发生的事情有所了解，请帮助我：D：D

ship is centered, cannon follows mouse. when ship is accelerating mouse press events are not working?? why?

游戏状态：

package code;

import java.util.ArrayList;

import org.jbox2d.common.Vec2;
import org.jbox2d.dynamics.World;
import org.lwjgl.input.Mouse;
import org.newdawn.slick.Color;
import org.newdawn.slick.GameContainer;
import org.newdawn.slick.Graphics;
import org.newdawn.slick.Input;
import org.newdawn.slick.SlickException;
import org.newdawn.slick.state.BasicGameState;
import org.newdawn.slick.state.StateBasedGame;
import org.newdawn.slick.tiled.TiledMap;

public class Play extends BasicGameState {
    public final int ID;
    public final int PPM = 20;

    public World world;
    public Player player;
    public ArrayList<BasicObject> pool = new ArrayList<BasicObject>();
    public TiledMap map;
    public Camera camera;

    public Play(int ID) {
        this.ID = ID;
    }

    @Override
    public void init(GameContainer gc, StateBasedGame sbg) throws SlickException {
        world = new World(new Vec2(0, 0));
        map = new TiledMap("res/map0.tmx");
        camera = new Camera(0, 0, gc.getWidth(), gc.getHeight());
        gc.getGraphics().setBackground(Color.white);

        spawn();
    }

    @Override
    public void render(GameContainer gc, StateBasedGame sbg, Graphics g) throws SlickException {
        g.translate(camera.x, camera.y);
        map.render(0, 0);
        for (BasicObject bo : pool) {
            bo.draw(g, PPM);
        }

        player.setAlpha((float) Math.toDegrees(Math.atan2(
                (((gc.getHeight() - Mouse.getY()) - camera.y) - player.getCenterY()*PPM),
                ((Mouse.getX() - camera.x) - player.getCenterX()*PPM)
                )));

        player.draw(g, PPM);

        //g.drawLine(player.getCenterX()*PPM, player.getCenterY()*PPM, Mouse.getX()-(camera.x), (gc.getHeight() - Mouse.getY())-(camera.y));
    }

    @Override
    public void update(GameContainer gc, StateBasedGame sbg, int delta) throws SlickException { 
        Input input = gc.getInput();
        player.update(delta);
        for (BasicObject bo : pool) {
            bo.update(delta);
        }

        if (input.isKeyDown(input.KEY_A)) {player.move("left", delta);}
        if (input.isKeyDown(input.KEY_D)) {player.move("right", delta);}
        if (input.isKeyDown(input.KEY_W)) {player.move("up", delta);}
        if (input.isKeyDown(input.KEY_S)) {player.move("down", delta);}
        if (Mouse.isButtonDown(0)) {
            System.out.println("mousepressed");
        }


        //player.getBody().applyForceToCenter(new Vec2((Mouse.getX()-(camera.x))/PPM, ((gc.getHeight() - Mouse.getY())-(camera.y))/PPM).sub(player.getBody().getPosition()));

        float deltaF = (float) delta/1000;
        world.step(deltaF, 6, 2);

        camera.x = player.getBody().getPosition().mul(PPM).mul(-1).x + gc.getWidth()/2;
        camera.y = player.getBody().getPosition().mul(PPM).mul(-1).y + gc.getHeight()/2;
    }

    public void spawn() {
        for(int i=0;i<map.getObjectCount(0);i++) {
            float theX = map.getObjectX(0, i);
            float theY = map.getObjectY(0, i);
            float theWidth = map.getObjectWidth(0, i);
            float theHeight = map.getObjectHeight(0, i);

            addWall(theX, theY, theWidth, theHeight);
        }

        for(int i=0;i<map.getObjectCount(1);i++) {
            if (map.getObjectType(1, i).equals("Player")) {
                float theX = map.getObjectX(1, i);
                float theY = map.getObjectY(1, i);
                float theWidth = 40;
                float theHeight = 60;

                player = new Player((theX + theWidth/2)/PPM, (theY + theHeight)/PPM, theWidth/PPM, theHeight/PPM, world);
            }
        }
    }

    public void addWall(float x, float y, float width, float height) {
        pool.add(new Wall((x + width/2)/PPM, (y + height/2)/PPM, width/PPM, height/PPM, world));
    }

    @Override
    public int getID() {
        // TODO Auto-generated method stub
        return ID;
    }
}

这是问题所在。当船舶正在加速时，Mouse.isButtonDown（0）不起作用。我在船舶移动时按下按钮测试它并检查控制台输出。

public void update(GameContainer gc, StateBasedGame sbg, int delta) throws SlickException { 
    Input input = gc.getInput();
    player.update(delta);
    for (BasicObject bo : pool) {
        bo.update(delta);
    }

    if (input.isKeyDown(input.KEY_A)) {player.move("left", delta);}
    if (input.isKeyDown(input.KEY_D)) {player.move("right", delta);}
    if (input.isKeyDown(input.KEY_W)) {player.move("up", delta);}
    if (input.isKeyDown(input.KEY_S)) {player.move("down", delta);}
    if (Mouse.isButtonDown(0)) {
        System.out.println("mousepressed");
    }


    //player.getBody().applyForceToCenter(new Vec2((Mouse.getX()-(camera.x))/PPM, ((gc.getHeight() - Mouse.getY())-(camera.y))/PPM).sub(player.getBody().getPosition()));

    float deltaF = (float) delta/1000;
    world.step(deltaF, 6, 2);

    camera.x = player.getBody().getPosition().mul(PPM).mul(-1).x + gc.getWidth()/2;
    camera.y = player.getBody().getPosition().mul(PPM).mul(-1).y + gc.getHeight()/2;
}

如果您需要查看更多类的代码，请告诉我，因为我不知道问题出在哪里，因此不知道要发布的代码：p

Answer 1

确定。我的问题的答案有点令人尴尬..：p原来是我的笔记本电脑是问题所在。由于某种原因，在键入xD时无法使用鼠标垫上的按钮我猜它具有某种安全功能，因此您在尝试输入时不要用手掌点击随机内容：）

插入USB鼠标，程序运行良好！非常感谢RPresle试图提供帮助;）

Answer 2

我不太了解LWJGL类和Slick之间的对应关系。无论如何，我认为你可以使用MouseListener给你的东西。您可以覆盖mouseClicked(int button, int x, int y, int clickCount)方法或mousePressed。

@Override
public void mouseClicked(int button, int x, int y, int clickCount) {
    if(button == Input.MOUSE_LEFT_BUTTON){
        System.out.println("LeftMouseClicked");
    }else{
        System.out.println("Else button clicked");}
}

这是BasicGameStat e继承自MouseListener的事实。

这绝对有效。然后，您可以设置标志以了解何时从update方法

中单击它

slick2d - 无法让鼠标单击事件正常工作

2 个答案: